symfony/src/Symfony/Component/EventDispatcher

EventDispatcher Component

EventDispatcher implements a lightweight version of the Observer design pattern.

use Symfony\Component\EventDispatcher\EventDispatcher;
use Symfony\Component\EventDispatcher\Event;

$dispatcher = new EventDispatcher();

$dispatcher->addListener('event_name', function (Event $event) {
    // ...
});

$dispatcher->dispatch('event_name');

Resources

You can run the unit tests with the following command:

phpunit -c src/Symfony/Component/EventDispatcher/

If you also want to run the unit tests that depend on other Symfony Components, declare the following environment variables before running PHPUnit:

export SYMFONY_DEPENDENCY_INJECTION=../path/to/DependencyInjection
export SYMFONY_HTTP_KERNEL=../path/to/HttpKernel